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Production process of ammonium molybdate

A production process and technology of ammonium molybdate, applied in the preparation of molybdenum compounds, molybdenum compounds, inorganic chemistry and other directions, can solve problems such as unfavorable environmental protection, large water consumption, excessive ammonia nitrogen discharge in wastewater, etc., and achieve elimination of molybdenum loss and molybdenum yield. Increased and reduced wastewater discharge

Inactive Publication Date: 2021-04-06
安庆市月铜钼业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the preparation method of ammonium molybdate in the prior art is easy to cause ammonia nitrogen to exceed the standard in wastewater discharge, which is not conducive to environmental protection, and consumes a lot of water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The production technology of ammonium molybdate comprises the following steps:

[0061] (1) Denitrification of molybdenum calcined sand with water

[0062] The molybdenum calcined sand in this example was purchased from Dexing Copper Mine of Jiangxi Copper Co., Ltd., and the molybdenum calcined sand was pickled molybdenum calcined sand with nitric acid. Therefore, the pickled molybdenum calcined sand contained a certain amount of nitrate (~0.5%). If the acid-washed molybdenum calcined sand is directly leached by alkaline oxygen pressure, the nitrate will enter the leachate, and the nitrate will gradually reduce the extraction capacity of the organic phase of the alkaline extraction. Therefore, water elution is used to remove nitric acid before entering the alkaline oxygen leaching. root. Slurry washing is carried out in a steel stirred reactor, and then multi-stage countercurrent washing is carried out by an automatic diaphragm box filter press until the nitrate conten...

Embodiment 2

[0098] The production technology of ammonium molybdate comprises the following steps:

[0099] (1) Denitrification of molybdenum calcined sand with water

[0100] The molybdenum calcined sand in this example was purchased from Dexing Copper Mine of Jiangxi Copper Co., Ltd., and the molybdenum calcined sand was pickled molybdenum calcined sand with nitric acid. Therefore, the pickled molybdenum calcined sand contained a certain amount of nitrate (~0.5%). If the acid-washed molybdenum calcined sand is directly leached by alkaline oxygen pressure, the nitrate will enter the leachate, and the nitrate will gradually reduce the extraction capacity of the organic phase of the alkaline extraction. Therefore, water elution is used to remove nitric acid before entering the alkaline oxygen leaching. root. Slurry washing is carried out in a steel stirred reactor, and then multi-stage countercurrent washing is carried out by an automatic diaphragm box filter press until the nitrate conten...

Embodiment 3

[0117] The production technology of ammonium molybdate comprises the following steps:

[0118] (1) Denitrification of molybdenum calcined sand with water

[0119] The molybdenum calcined sand in this example was purchased from Dexing Copper Mine of Jiangxi Copper Co., Ltd., and the molybdenum calcined sand was pickled molybdenum calcined sand with nitric acid. Therefore, the pickled molybdenum calcined sand contained a certain amount of nitrate (~0.5%). If the acid-washed molybdenum calcined sand is directly leached by alkaline oxygen pressure, the nitrate will enter the leachate, and the nitrate will gradually reduce the extraction capacity of the organic phase of the alkaline extraction. Therefore, water elution is used to remove nitric acid before entering the alkaline oxygen leaching. root. Slurry washing is carried out in a steel stirred reactor, and then multi-stage countercurrent washing is carried out by an automatic diaphragm box filter press until the nitrate conten...

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Abstract

The invention discloses a production process of ammonium molybdate, which relates to the technical field of ammonium molybdate production, and comprises the following steps: (1) washing and filter-pressing molybdenum calcine, mixing the filter-pressed molybdenum calcine with a leaching agent, adjusting the pH value to 10-11.5, and keeping the temperature for 2-3 hours under the conditions of oxygen partial pressure of 20 atm and temperature of 150-170 DEG C to obtain a sodium molybdate solution; (2) adding quaternary ammonium salt into the ammonium molybdate solution, extracting molybdenum under an alkaline condition, and adding ammonium bicarbonate into the extracting solution to obtain an ammonium molybdate solution; (3) adding calcium oxide into the extracting solution; (4) evaporating and crystallizing the ammonium molybdate solution to obtain ammonium dimolybdate; and (5) adding acid into the crystallization mother liquor after the ammonium dimolybdate is prepared for precipitation to obtain ammonium tetramolybdate, adjusting the pH value of the ammonium tetramolybdate solution to 1.5-2.0 by using nitric acid, and separating out ammonium tetramolybdate crystals. The method has the beneficial effects that the method has the advantages of short process flow, low consumption of chemical reagents and high resource adaptability.

Description

technical field [0001] The invention relates to the technical field of ammonium molybdate production, in particular to a production process of ammonium molybdate. Background technique [0002] Ammonium molybdate is an important intermediate and product of molybdenum salt. At present, the production method of ammonium molybdate mainly adopts ammonia leaching method, such as roasting molybdenite ore to produce industrial molybdenum oxide, and then pickling and ammonia leaching to obtain crude molybdenum ammonium molybdate solution, ammonium sulfide was removed to obtain refined ammonium molybdate solution, ammonium tetramolybdate was obtained through nitric acid precipitation, and finally ammonium dimolybdate was obtained through ammonia dissolution, evaporation and crystallization. [0003] For example, the patent application with the publication number CN110127761A discloses a method for crystallization of ammonium molybdate, after pickling the molybdenum baked sand, it is s...

Claims

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Application Information

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IPC IPC(8): C01G39/00
CPCC01G39/00C01G39/003
Inventor 徐鸿飞徐尊平江来高
Owner 安庆市月铜钼业有限公司
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